Parameters of the transferred hyperfine interactions (THFI) for O¹⁷: LaMnO₃ have been estimated at room temperature. Satisfactory agreement with experiment has been obtained.

We review some aspects of the electron paramagnetic resonance (EPR) studies in quasi-one-dimensional inorganic compounds with special emphasis on the angular dependencies of g-factors, linewidth and the information they reveal about the physical system. In particular, we employ for the analysis of the data the method of moments and outline the expressions for the second and the fourth moments which is related to different spin-spin interactions.

We theoretically investigated the static magnetic susceptibility in the heavy fermion compounds YbRh₂Si₂ and YbIr₂Si₂. The molecular field approximation together with the renormalization of the Kondo interaction by the high energy conduction electrons excitations result in the Curie Weiss law and Van Vleck susceptibility with temperature dependent Curie and Weiss parameters.